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Re: Sensible way to extend base class?
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Re: Sensible way to extend base class?


  • Subject: Re: Sensible way to extend base class?
  • From: Kiel Gillard <email@hidden>
  • Date: Wed, 20 May 2009 23:15:43 +1000

Can you use composition in your application to compose an instance of class E with instances of framework classes A through to D?

Kiel ;-)
"Peace cannot be achieved through violence, it can only be attained through understanding."
Albert Einstein


On 20/05/2009, at 10:09 PM, Graham Cox wrote:

I have a base class in a framework, let's call it A. This has a number of subclasses, B C and D.

I have some functionality I'd like to add that would apply to all A, B, C and D. So a category on A would be fine - except that I need some support in the form of a couple of ivars. The added functionality isn't appropriate to the framework, so though I have the source for A, adding ivars that have no place there grieves me.

It also grieves me that the solution appears to be separate subclasses of B, C and D to add the functionality which must be duplicated for each class.

Any solution I've missed?

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References: 
 >Sensible way to extend base class? (From: Graham Cox <email@hidden>)

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